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Nikolay Borisov 6e7ca09b58 btrfs: Fix deadlock caused by missing memory barrier 
Commit 06297d8cefca ("btrfs: switch extent_buffer blocking_writers from
atomic to int") changed the type of blocking_writers but forgot to
adjust relevant code in btrfs_tree_unlock by converting the
smp_mb__after_atomic to smp_mb.  This opened up the possibility of a
deadlock due to re-ordering of setting blocking_writers and
checking/waking up the waiter. This particular lockup is explained in a
comment above waitqueue_active() function.

Fix it by converting the memory barrier to a full smp_mb, accounting
for the fact that blocking_writers is a simple integer.

Fixes: 06297d8cefca ("btrfs: switch extent_buffer blocking_writers from atomic to int")
Tested-by: Johannes Thumshirn <jthumshirn@suse.com>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2019-07-25 17:34:08 +02:00
..
9p
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 188
2019-05-30 11:29:21 -07:00
adfs
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2019-06-19 17:09:55 +02:00
affs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
afs
AFS fixes
2019-06-28 08:34:12 +08:00
autofs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 83
2019-05-24 17:37:52 +02:00
befs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
bfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
btrfs
btrfs: Fix deadlock caused by missing memory barrier
2019-07-25 17:34:08 +02:00
cachefiles
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
2019-05-24 17:27:11 +02:00
ceph
ceph: fix ceph_mdsc_build_path to not stop on first component
2019-06-27 18:27:36 +02:00
cifs
SPDX update for 5.2-rc6
2019-06-21 09:58:42 -07:00
coda
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
configfs
SPDX update for 5.2-rc3, round 1
2019-05-31 08:34:32 -07:00
cramfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
crypto
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
debugfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
devpts
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 83
2019-05-24 17:37:52 +02:00
dlm
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 398
2019-06-05 17:37:12 +02:00
ecryptfs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333
2019-06-05 17:37:06 +02:00
efivarfs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
efs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
exportfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
ext2
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
ext4
Bug fixes (including a regression fix) for ext4.
2019-05-25 15:03:12 -07:00
f2fs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
fat
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282
2019-06-05 17:36:37 +02:00
freevxfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
fscache
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
fuse
Revert "fuse: require /dev/fuse reads to have enough buffer capacity"
2019-06-11 13:35:22 +02:00
gfs2
Fix rounding error in gfs2_iomap_page_prepare
2019-06-14 17:27:12 -10:00
hfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
hfsplus
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
hostfs
This pull request contains the following changes for UML:
2019-05-12 17:52:13 -04:00
hpfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
hugetlbfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
isofs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 142
2019-05-30 11:25:17 -07:00
jbd2
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
jffs2
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
jfs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
2019-05-30 11:26:35 -07:00
kernfs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428
2019-06-05 17:37:16 +02:00
lockd
Revert "lockd: Show pid of lockd for remote locks"
2019-05-31 09:43:26 -04:00
minix
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
nfs
NFS/flexfiles: Use the correct TCP timeout for flexfiles I/O
2019-06-28 11:48:52 -04:00
nfs_common
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
nfsd
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 1
2019-05-21 11:28:39 +02:00
nilfs2
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
nls
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
notify
fanotify: update connector fsid cache on add mark
2019-06-19 15:53:58 +02:00
ntfs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 97
2019-05-24 17:37:53 +02:00
ocfs2
fs/ocfs2: fix race in ocfs2_dentry_attach_lock()
2019-06-13 17:34:56 -10:00
omfs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 209
2019-05-30 11:29:53 -07:00
openpromfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
orangefs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
overlayfs
SPDX update for 5.2-rc6
2019-06-21 09:58:42 -07:00
proc
fs/proc/array.c: allow reporting eip/esp for all coredumping threads
2019-06-29 16:43:44 +08:00
pstore
SPDX update for 5.2-rc4
2019-06-08 12:52:42 -07:00
qnx4
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
qnx6
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
quota
quota: fix a problem about transfer quota
2019-06-19 15:25:41 +02:00
ramfs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
reiserfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
romfs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
squashfs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 499
2019-06-19 17:09:53 +02:00
sysfs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
sysv
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
tracefs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
ubifs
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 336
2019-06-05 17:37:07 +02:00
udf
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
ufs
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
unicode
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 294
2019-06-05 17:36:38 +02:00
xfs
block: return from __bio_try_merge_page if merging occured in the same page
2019-06-17 09:33:02 -06:00
aio.c
signal: remove the wrong signal_pending() check in restore_user_sigmask()
2019-06-29 16:43:45 +08:00
anon_inodes.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
attr.c
…
bad_inode.c
…
binfmt_aout.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
binfmt_elf_fdpic.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
binfmt_elf.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
binfmt_em86.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
binfmt_flat.c
fs/binfmt_flat.c: make load_flat_shared_library() work
2019-06-29 16:43:45 +08:00
binfmt_misc.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
binfmt_script.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
block_dev.c
block: Don't revalidate bdev of hidden gendisk
2019-05-27 07:35:02 -06:00
buffer.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
char_dev.c
chardev: update comment based on the code
2019-04-02 17:49:58 +02:00
compat_binfmt_elf.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 193
2019-05-30 11:29:21 -07:00
compat_ioctl.c
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compat.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
coredump.c
…
d_path.c
…
dax.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288
2019-06-05 17:36:37 +02:00
dcache.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
dcookies.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
direct-io.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
drop_caches.c
fs/drop_caches.c: avoid softlockups in drop_pagecache_sb()
2019-02-01 15:46:24 -08:00
eventfd.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
eventpoll.c
signal: remove the wrong signal_pending() check in restore_user_sigmask()
2019-06-29 16:43:45 +08:00
exec.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
fcntl.c
fs: mark expected switch fall-throughs
2019-04-08 18:21:02 -05:00
fhandle.c
…
file_table.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
file.c
io_uring-2019-03-06
2019-03-08 14:48:40 -08:00
filesystems.c
vfs: Implement a filesystem superblock creation/configuration context
2019-02-28 03:29:26 -05:00
fs_context.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
2019-05-24 17:27:11 +02:00
fs_parser.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
2019-05-24 17:27:11 +02:00
fs_pin.c
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fs_struct.c
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2019-05-21 10:50:45 +02:00
fs_types.c
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fs-writeback.c
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2019-05-21 10:50:45 +02:00
fsopen.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
2019-05-24 17:27:11 +02:00
inode.c
mm: fix page cache convergence regression
2019-05-31 13:52:41 -04:00
internal.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
io_uring.c
Merge branch 'akpm' (patches from Andrew)
2019-06-29 17:11:01 +08:00
ioctl.c
…
iomap.c
block: return from __bio_try_merge_page if merging occured in the same page
2019-06-17 09:33:02 -06:00
Kconfig
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
Kconfig.binfmt
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
libfs.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
locks.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
Makefile
Add as a feature case-insensitive directories (the casefold feature)
2019-05-07 21:12:44 -07:00
mbcache.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
mount.h
saner handling of temporary namespaces
2019-01-30 17:44:07 -05:00
mpage.c
block: remove the i argument to bio_for_each_segment_all
2019-04-30 09:26:13 -06:00
namei.c
Clean up fscrypt's dcache revalidation support, and other
2019-05-07 21:28:04 -07:00
namespace.c
fs/namespace: fix unprivileged mount propagation
2019-06-17 17:36:09 -04:00
no-block.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
nsfs.c
nsfs: unobfuscate
2019-04-09 19:20:57 -04:00
open.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
pipe.c
Merge branch 'page-refs' (page ref overflow)
2019-04-14 15:09:40 -07:00
pnode.c
fs/namespace: fix unprivileged mount propagation
2019-06-17 17:36:09 -04:00
pnode.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 209
2019-05-30 11:29:53 -07:00
posix_acl.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
proc_namespace.c
…
read_write.c
vfs: pass ppos=NULL to .read()/.write() of FMODE_STREAM files
2019-05-06 17:46:52 +03:00
readdir.c
…
select.c
signal: remove the wrong signal_pending() check in restore_user_sigmask()
2019-06-29 16:43:45 +08:00
seq_file.c
fs: mark expected switch fall-throughs
2019-04-08 18:21:02 -05:00
signalfd.c
fs: mark expected switch fall-throughs
2019-04-08 18:21:02 -05:00
splice.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
stack.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
stat.c
fs: move generic stat response attr handling to vfs_getattr_nosec
2019-02-01 01:55:45 -05:00
statfs.c
vfs: add vfs_get_fsid() helper
2019-02-07 16:38:35 +01:00
super.c
[fix] get rid of checking for absent device name in vfs_get_tree()
2019-04-28 21:34:21 -04:00
sync.c
fs/sync.c: sync_file_range(2) may use WB_SYNC_ALL writeback
2019-05-14 09:47:50 -07:00
timerfd.c
y2038: syscalls: rename y2038 compat syscalls
2019-02-07 00:13:27 +01:00
userfaultfd.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 499
2019-06-19 17:09:53 +02:00
utimes.c
y2038: syscalls: rename y2038 compat syscalls
2019-02-07 00:13:27 +01:00
xattr.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00